Mechanical movement.



W. S. MILLER.

MECHANICAL MOVEMENT.

APPLICATION FILED JUNE 26. 1913.

1,221,471., Patented A i 3,1917.

lNIII WITNESSES MM 6W2??? WILLIAM S. MILLER, OF WASHINGTON, DISTRICT OFCOLUMBIA.

MECHANICAL MOVEMENT.

Application filed June 26, 1913.

To all whom it may concern:

Be it known that I, l/VILLIAM S. MILLER, a citizen of the United States,residing at 3067 Canal street northwest, Washington, in the District ofColumbia, have invented certain new and useful Improvements inMechanical Movements, of which the following is a specification.

This invention relates to improvements in mechanical movements.

The invention has for its object, primarily, to provide for theactuation of a common endless, motion-transmitting element, as a belt ofthe crossed type, without liability of its runs contacting with eachother, as in effecting the actuation of oppositely reciprocated ordriven elements from a common means."

A further object is to carry out the aforesaid end in a simple andeffective manner, and with reduced friction.

- The invention, therefore, consists, generically of a mechanicalmovement, including a rotary element characterized by the equipment of aspirally arranged plurality of sprocket teeth upon its periphery, withwhich teeth is adapted to engage an endless belt or motion-transmittingelement, it being understood, of course, that by means of thisarrangement a rotary reciprocating motion is designed to be transmittedto the shaft to which. said rotary member or pulley is in practice,attached for actuating machinery to which it may be desired to impartsuch motion.

It further consists of detailed structural features andinstrumentalities substantially as hereinafter more fully described anddefined by the appended claim.

In the accompanying drawing is illustrated the preferred embodiment ofmy invention wherein it will be understood that various changes andmodifications as to the detailed construction and arrangement of theparts may be made without departing from the spirit of the invention,and in which drawing Figure 1 is a perspective view of my invention.

Specification of Letters Patent.

Patented Apr. 3, 191% Serial No. 775,937.

Fig. 2 is a detailed like view of the reciprocal element or sprocketpulley or wheel.

In carrying out my invention I suitably provide a pulley or wheel 1, andequip or arm said wheel or pulley, upon its periphcry, with a spirallyarranged plurality of sprocket-teeth or cogs 2, being preferably of theoutline as disclosed to provide for the engagement therewith of anendless linkbelt 8 of the common type.

With the belt 3 suitably engaged with the teeth of the pulley periphery,as stated, it will be noted that a rotary reciprocatory motion may beimparted to the pulley by suitably actuating the belt as readilyunderstood, and that by causing the belt to encompass or engagesimultaneously an oppositely positioned and similarly toothed F orcogged pulley and crossing the runs of the belt thereloetween, as alsowell understood, the pulleys may be oppositely reciprocated by actuatingthe belt and that the thus crossed runs will not contact with eachother, as in the employment of the ordinary sprocket-toothed pulley orwheel as is apparent, and thus provide for reducing friction andavoiding unsatisfactory action of the parts, as is also thought obvious.

Having thus described my invention, what I claim as new is:

A device of the type described including a rotary member having itsperiphery provided with a plurality of sprocket teeth arranged totraverse the periphery spirally' for engagement with a sprocket-chain,said spiral arrangement of teeth, holding the leads apart so that theywill not contact each other at the point at which they pass one another,said spirally toothed sprocket rotary member being employed where it isdesired to impart a reverse reciprocatory movement from a shaft to ashaft on which said spirally toothed member is keyed.

In testimony whereof I aflix my signature in presence of two witnesses.

WILLIAM S. MILLER. Witnesses:

WILLIAM XANDER, R. R. DUFFIE.

tomes of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

